24. Write the formula for the compound barium oxide.

What block does sodium belong to? s-block p-block d-block or f-block

The earliest and simplest definition of acids and bases was suggested by

Ammonia (NH3 (g), Hf = - 45.9 kJ/mol) reacts with oxygen to produce nitrogen and water (H2 O (g), Hf = - 241.8 kJ/mol) according to the equation below. What is the enthalpy of the reaction? 1) - 3,572.1 kJ 2) - 1,267.2 kJ 3) 1,267.2 kJ 4) 3,572.1 kJ

4. Which state of matter has a definite volume and takes the shape of its container? solid liquid gas

What happens to object or matter when an explosion occurs?

Butter is melted in a pan. Which of the following is true about the change? Select one: a. It is a physical change that absorbs energy. b. It is a physical change that releases energy. c.

The freons are a class of compounds containing carbon, chlorine, and fluorine. while they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere.

Write its complete chemical symbol including mass number, atomic number, and net charge (if any).

How would you be able to use the spectrum of each gas to establish its identity

Which does not add to the reliability of a scientific source of information? displaying data in a colored chart clearly identifying the sources of the data explaining how the data was collected showing that many scientists had reviewed the